However ITV’s documentary, which began an hour earlier, did beat BBC One’s Antiques Roadshow, which averaged 4.9 million.
The Night Manager, an updated version of John Le Carre’s 1993 novel, has been a hit with viewers and on social media.
The Queen’s documentary featured royalty, politicians and celebrities.
Reviews have been positive for BBC One’s The Night Manager, starring Tom Hiddleston as enigmatic Jonathan Pine, who goes undercover in a bid to expose the activities of billionaire arms dealer Richard Roper, played by Hugh Laurie.
Our Queen at 90 included extensive behind-the-scenes footage of the Royal Family at work and at play.